#include <stdio.h>
#include <string.h>
#define MAXN 64
int a[MAXN][MAXN];
int main ()
{
    int n,x,y,tot=0;
    scanf("%d",&n);
    memset(a,0,sizeof(a));
    tot=a[x=0][y=n-1]=1;
    while (tot < n*n)
    {
        while (x+1 < n && !a[x+1][y]) a[++x][y] = ++tot;
        while (y-1 >= 0 && !a[x][y-1]) a[x][--y] = ++tot;
        while (x-1 >= 0 && !a[x-1][y]) a[--x][y] = ++tot;
        while (y+1 <n && !a[x][y+1]) a[x][++y] = ++tot;
    }
    for (x = 0;x < n; x++)
    {
        for (y = 0;y<n;y++) printf("%5d",a[x][y]);
        printf("\n");
    }
    return 0;
}
